To note that in the OP’s Victoria a Special Resolution would probably not be needed to install a CCTV system. A committee decision alone would probably be enough.
In larger OCs in Victoria, Special Resolutions can be very difficult to achieve. A SR in Victoria, at the very minimum, needs at least need 50% of owners to actually vote – something which alone is almost mission impossible in larger OCs. They also must vote in favour.
The OC could consider making a rule (the Victoria equivalent of a by-law) about the access but creating a rule again needs a SR! In my experience it’s best left to the committee to decide the circumstances of giving access. That also provides for some flexibility.